Plaster or composition board.



narran srn'rns PATENT OFFICE.

GUSTAVE RADER, OF MONTOLAIR, NEW JERSEY, ASSIGNOR OF ONE-HALF TO A. ALEXANDER EDELMAN, OF BROOKLYN, NEW YORK.

:BLASTER OR COMPOSITION BOARD.

Specification of Letters Patent.

Patented .Tune 23, 1908.

Application led April 28, 1908. Serial No. 429,674.

To all whom it may concern:

Be it known that I, GUsTAvE RADER, a

citizen of the United States, residing at Montclair, in thecounty of Essex and State of New Jersey, have invented certain new and useful Improvements in Plaster or Composition Boards, of which the following is a specification.' This invention relates to an improvement on my prior U. S. patent, N o. $4,954, April 14, 1,908, and is an improved plaster or composition board' for covering walls, ceilings, etc.

The object of my invention is 'to make a plaster or composition .board which shall be ready for use so that it can be directly applied to walls or ceilings, without requiring a finishing coat, in such a manner that the wall paper or other covering may be directly pasted thereto.

The invention therefore consists of a plaster or composition board comprising a body of plastic material having thoroughly `mixed therewith hair or other strong and fairly long ber which holds and keeps the bpard together and prevents'the same from cracking or falling apart, the `board having secured thereto one or more outside or face layers of paper, felt or any other fabric, the sides of 1which next to the mixed plastic ma-l terial are roughened or made to have project-- A ing bers over substantially their entire sur- 4- face, Jvhereby the brous fabric adheres strongly to the plastic body.

In the accompanying drawings Figure 1 represents a perspective view of my improved plaster board; and Fig. 2 is a horizontal section of the board shown in Fig. 1.

Similar letters of reference indicate corresponding parts. g

Referring to the'drawings, 1 represents a layer of plastic material mixed with suitabl hair or bers and 2, 3, are face layers o brous material. The brous material may be paper, felt or any other fabric having one side rough or roughencd s as to have projecting bers.

The plastic material may be plaster-ofparis, cement, or other self-hardening material. The mede of manufacture of this plaster or comp'csitiibn board is as follows A table such as is described in my Letters Patent No. 884,953, April 14, 1908, is used. On this table, the sides of which are raised to make a board ef the required thickness, is

Aspread the paper, felt, or other fabric, as

above described, with that side which is rough and has projecting fibers, uppermost.

On this 'paper is then spread a layer of hair or any other strong ber and over this layer is poured a mass of plastic material, such as smooth. Afterthe leveling the board is left to dry until hard enough to handle, the surface being adapted for receiving a further coat of plaster if desired. If the board is to be covered on both sides by layers of paper, felt or other fabric, such a layer is spread on the top-of the still soft plastic material with the side :having the projecting bers down-- ward. The operator then uses his leveling rod to press the fabric tightly against the plastic material forcing the projecting bers of the fabric into the mass and forming an F86 intimate and permanent connectin between .the face layer and the body of the board.

As a result of the process there is produced a plaster or coinpositionboard which is strong, practically unbreakable and absolutely fireproof.

I claim:

1. A plaster or composition board consisting of a layer of hardened plastic material and one or more outside or face layers of brous material, the back or backs of which, next to the plastic material, have projecting bers over substantially their entire surface whereby the; plastic material is made to adhere rmly to the brous material.

2. A plaster or composition board consisting of a layer of hardened plastic material, and one or moreoutside or face layers of brous material, the back or backs of which, next to the plastic material have been made rough to produce projecting bers over substantially their entire surface whereby the plastic .material is made to adhere rmly to the brous material.

3. A plaster or composition board consisting of a layer of plaster-of-paris, hair or Tiber mixed to strengthen same, and one or more outside or face layers of librous materialI the back or backs of which next to the 5 plastic material have projecting fibers over substantially their entire surface whereby the plastic material is made to adhere irmly to the iibrous material.

4. A plaster or composition board con- 10 sisting' of a layer of plaster-of-paris and ber mixed, and one or more outside or face layers of paper, felt or any other fabric, the back or backs of which next to the plastic material have projecting fibers over substantially their entire surface whereby the plastic ma- 15 terial is made to adhere irmly to the paper, felt or fabric.

In testimony whereof7 I my signature in presence of two witnesses.

GUSTAVE BADER.

T\7Vitnesses:

B. GOETZ, BERNARD EDELMAN. 

